• Journal of the Korean Geographical Society
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• v.16
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• pp.1-9
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• 1977

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1986.04a
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• pp.234-238
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• 1986

• International Journal of Quality Innovation
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• v.1 no.1
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• pp.106-120
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• 2000

The purpose of this research is to understand the effects of Quality Management Award on stock prices movement and to examine the comparative advantages of quality award system in Korea and the U.S. This study compares the performances of QM Award companies in the stock market with those of the market index in both countries. We develop Korean Quality Award Index(KQA Index) based on the Baldrige Index of NIST in the U.S. We inspect three studies. Study 1 tests if the performances of MB Award winners and S&P500 index have a difference in the stock market. Study 2 tests if the performances of KQA winners and KOSPI(Korean Composite Stock Price Index) have a difference in the stock market. Study 3 tests if the performances of KQA winners and MB Award winners have a difference in the stock market. From the empirical tests, the performances of KQA winners are superior to those of KOSPI and the performances of MB Award winners are superior to those of S&P500 and the performances of MB Award winners are superior to those of KQA winners.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.649-650
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• 2006

An analysis is made of a new 1Gbps MB-OFDM system having same bandwidth and transmission power as conventional 480Mbps system. $2{\times}2$ MIMO scheme and MLD with soft decision demodulation algorithm are proposed in this paper. As a result of hardware implementation, it showed as same performance as conventional MB-OFDM system, while presenting doubled data rates and low complexity.

• Journal of the Institute of Convergence Signal Processing
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• v.5 no.3
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• pp.230-235
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• 2004

This paper describes FPGA implementation of a pointer interpreter which can support a synchronization of SDH(or SONET)-based transmission network. The pointer interpreter consists of a pointer-word extractor and a pointer-word interpreter The pointer-word extractor which is composed of mod-6480 counter, shift register and pointer synchronizing block, finds out the H1 and H2 pointer word from a 51.84 Mb/s AU-3/STS-1 data frame and then performs the synchronizing with a 6.48 Mb/s by dividing them in 8. Based on the extracted pointer word, pointer-word interpreter analyzes pointer states such LOP, AIS and NORM according to pointer state-transition algorithm. It consists of a majority vote, a pointer word valid/invalid check, a pointer justification, and a pointer state check. The simulation results of Xilinx Virtex XCV200PQ240 FPGA chip shows the exact pointer word extraction and correct decision of pointer status based on extracted pointer word. The proposed pointer interpreter is suitable for pointer interpretation of 155 Mb/s STM-1/STS-3 frame.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.8 no.1
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• pp.23-37
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• 1998

This paper considers the design and management of security MIB for EDI system. EDI system has to establish various securety wervices and mechanisms to protect against security threats. Hence, the EDIsystem requires appropriate security management to monitor and control the security obhects for its security services and mechanisms. In this paper, I identify security objects for management of secueity services defined in the EDIsystem, and propose the design of a security MIB and describe the use of SNMPnetwork management protocol in its management.

• Journal of the Korean Society of Radiology
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• v.12 no.6
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• pp.785-791
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• 2018

Recently, Disk array is widely used as a long term storage device in PACS, but reliability is not enough in relation to annual failure rate of disk. Between October 2016 and February 2017, we scanned the serial port of the hard disk while reading or storing medical images on a PACS reader. The data rate was calculated from the data stored in HDD 99ea that were used in the PCAS image storage device and in HDD 101ea that were used in the Personal Computer. When a CT image was read from a PACS reader, Reading was 87.8% and Writing was 12.2% in units of several tens of megabytes or less. When the CT image was stored in the PACS reader, Reading was 11.4% and Writing was 88.6% in units of several tens of megabytes or less. While reading the excel file on the personal computer, Reading was 75% and Writing was 25% in less than 3 MB, and In the process of storing the excel file on the personal computer, Reading was carried out by 38% and Writing was carreid out 62% in the units of 3 MB or less. The transfer rate of the hard disk used in the PACS image storage device was 10 GB/h, and the transfer rate per hour of the hard disk of the personal computer was 5 GB / h. Annual failure rate of hard disk of image storage system is 0.97 ~ 1.13%, Annual failure rate of Hard Disk of personal computer is 0.97 ~ 1.13%. the higher transfer rate is, the higher annual failure rate is. These results will be used as a basis for predicting the life expectancy of the hard disk and the annual failure rate.

• Journal of Advanced Navigation Technology
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• v.8 no.1
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• pp.73-80
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• 2004

In the case of Non-Line-of-Sight (NLOS), common telecommunication systems typically have Rayleigh distributed amplitude characteristics. However measurement result of Ultra Wideband (UWB) Multi-Band Orthogonal Frequency Division Multiplexing (MB-OFDM) system which is proposed as one of candidate standard in IEEE 802. 15. 3a for Wireless Personal Area Network (WPAN) shows that it has independent log normal fading in each cluster as well as in each ray within the cluster. Based on this clustering phenomenon observed, MB-OFDM channel model derived from Saleh-Valenzuela model with a couple of slight modifications. In this paper, channel remodeling for RF frequency hopping in MB-OFDM system is achieved, and performances of MB-OFDM system for each channel mode and data rate are verified using modified channel model.

• Journal of Acupuncture Research
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• v.26 no.3
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• pp.27-38
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• 2009

목적 : 이 연구는 Vipera lebetinat turanica의 사독약침액(蛇毒藥鍼液)(Snake venom toxin, SVT)이 인간 유방암 세포주인 MCF-7과 MDA-MB-231 세포에서 암세포성장의 억제 및 그 기전에 대하여 살펴보고자 하였다. 방법 : SVT를 처리한 후 MCF-7과 MDA-MB-231의 성장억제를 관찰하기 위해 CCK-8 assay를 시행하였고, apoptosis 평가에는 TUNEL assay를 시행하였다. 세포자멸사 관련 세포기전을 보기 위하여 세포내 활성산소량 및 미토콘드리아의 세포막전위 변화를 측정하였고, 세포자멸사 조절 단백인 Bax, Bcl-2 발현 변화 관찰에는 westem blot analysis를 시행하였다. 결과 : MCF-7과 MDA-MB-231 세포에 SVT를 처리한 후, 유방암 세포의 성장, Apoptosis의 유발 및 기전에 미치는 영향을 관찰하여 다음과 같은 결과를 얻었다. 1. MCF-7 세포와 MDA-MB-231 세포에서 SVT를 처리한 후 유방암 세포 성장이 억제되었다. 2. TUNEL assay를 통한 세포자멸사 평가에서 SVT를 처리한 MCF-7세포와 MDA-MB-231 세포 모두 세포자멸사 활성세포의 유의한 증가를 나타내었다. 3. 세포자멸사 관련 세포기전연구에서 SVT를 처리한 MCF-7 세포와 MDA-MB-231 세포에서 세포내 활성산소의 유의한 증가와 미토콘드리아 세포막 전위의 유의한 변동이 관찰되었다. 4. SVT를 처리한 MCF-7세포와 MDA-MB-231세포는 세포자멸사 관련 단백 발현에서 Bax의 유의한 증가와 Bcl-2의 유의한 감소를 나타내었다. 결론 : 이상의 결과는 SVT가 세포내 활성산소를 증가시킴으로써 미토콘드리아의 세포막전위에 변화를 일으켜 유방암 세포주인 MCF-7과 MDA-MB-231 세포에 세포자멸사를 유발하여 증식억제 효과가 있음을 입증한 것이다.

• Journal of the Korean Society of Food Science and Nutrition
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• v.35 no.6
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• pp.671-676
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• 2006

We investigated the effect of gingerol (Zingiber officinale Roscoe, Zingiberaceae) on Bcl-2 and Bax expression in MDA-MB-231 human breast cell lines. The oleoresin from rhizomes of ginger contains [6]-gingerol (1-[4'-hydroxy-3'-methoxyphenyl]-5-hydroxy-3-decanone). We previously reported that [6]-gingerol inhibits cell proliferation in MDA-MB-231 human breast cancer cell lines. In this study, we examined protein and mRNA expression associated with cell apoptosis in MDA-MB-231 human breast cancer cell lines. We cultured MDA-MB-231 cells in presence of various concentrations 0, 2.5, 5 and $10\;{\mu}M$ of [6]-gingerol. Bcl-2 protein and its mRNA levels were decreased dose-dependently in cells treated with [6]-gingerol, but Bax protein and its mRNA levels were unchanged by [6]-gingerol treatment. Bcl-2/Bax ratio was decreased in a dose dependent manner treated with [6]-gingerol. Caspase-3 activity was significantly increased dose-dependently in cell treated with [6]-gingerol (p<0.05). In conclusion, we have shown that [6]-gingerol induces apoptosis in MDA-MB-231 human breast cancer cell lines.